Sachin was always regarded as the best bat from mid/late 90s till career end, except by a minority who preferred Lara or ponting when he was peaking. Ponting was recognised as the form bat for x years in the 2000s. Seeing as you don't hold a consistent standard on how long qualifies (or hold any?), there will be many, many bats who qualify as best form bats. Just about every decent bat goes through a beast phase of wildly differing lengths.We don't need to imagine since he played on those pitches in that period. Maybe your argument is that with more time and facing weaker attacks, his average would rise, I agree, but 60 is a stretch.
You have been given a lot of reasons why the idea is poor. Opinions can be wrong. There is never as much concensus as you claim. You can be denied a spot by playing at the same time as a quality bat or peaking at the wrong time, whereas a worse bat will make the grade by a quirk of timing. Time lengths are too short and inconsistent. Etc.